William wilmington



W. WILMINGTON. GAR WHEEL.

No.- 82,466. I Patented Sept. 22, 1 868.

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Letters Patent N). 82,466, dated September 22, 1868.

IMPROVEMENT IN GAR-WHEELS.

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TO ALL .IT MAY CONCERN:

7 Be it known that I, WILLIAM WILMINGTON, of Toledo, in the county of Lucas, and State of Ohio, have invented a new article of manufacture in the shape of .an Improved Cast-Iron Car-Wheel; andI do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, which form a portion of this specification- Figure 1 being a side view of the central portion of a car-wheel mould,-and

Figure 2 a section of the entire mould, in the line a: x of fig. 1, the said drawings representing one method of moulding and casting my said improved car-wheel. I i T Figure 3 is a side view of a central portion-of a catwheel mould, and

Figure 4 a section-of the entire mould, in the line y y of fig. 3, representing another method of casting the same car-wheel.

In appearance, my improved east-iron car-wheel does not differ from other cast-iron car-wheels, but in the matter of strength and durability, it greatly surpasses any ear-wheel that has ever been placed beneath a railear. This superiority is due to the employment-of two different qualities of cast iron in the manufacture of said wheel, viz, a chill-hardening iron, to form the rim of saidwheel, and a softer and stronger iron, to form the hub and plate-portions of the seine. In the mould represented by figs. 1 and 2 of the accompanying drawings, the chill-hardening iron is poured, at the proper temperature, into the ,basin 2', from which it flows into the central tube m, and thence through any desired number of channels, it it, into the rim-portionf of'the moulded wheel, as shown in fig. 2.' The softer and stronger iron,- which is taken from a contiguous furnace, is poured, at the proper temperature, into the annular basin k,.from which it flows through any desired number of channels Z Z, into the hub-portion of the moulded wheel, and thence outwards into the plate-portion of same, until it' meets the inward flow of the ohill-hardening iron near the rim of the wheel. The pouring of the chill-hardening iron should precede by a. few seconds the pouring of the softer iron, and should be amply suificient in quantity to form the rim-portion of the wheel. When the inward flow of the melted chill-hardening iron-is met by the outward flow of the larger body ofmelted soft iron in the plate-portion of the wheel, the latter will carry before it the said chill-hardening iron, and force it into the rim-portion of the wheel. The meeting of the said opposing currents of melted iron, -and the forcing outwards of the chill-hardening iron by the melted softer iron, will cause a suflicient amount of mingling of the two qualities of iron, to form a sound and reliable union between the two.

In the mould represented by figs. 3 and 4 of the accompanyingdrawings, the chill-hardening iron is poured,

at the proper temperature, into the annular basin a,-'from which it flows throughanydesired number of chaunelsb 6, into the rim-portionfof the moulded wheel. The softer and stronger iron, which is taken from a contiguous furnace, is poured, at the proper temperatureflnto the central basin 0, from which it flows, through any desired number of channels 02 d, into the hub-portion of the wheel, and thence outwardly into the plate-portion ofthe same, until it meets the inward flow of the chill-hardening iron first poured into the mould, which latterit presses outwards into the rim-portion of the wheel, and'by so doing, produces a suflicient amount of minglingf 'of'the two qualities of melted iron to firmly and soundly unitethe two-with each other.

The chill g, which forms the periphery of the moulded car-wheel, maybe ofthe usual proportions, and the. sand-portion of said mould may be formed in any well-known or usual manner. Any desired shape may be given to the hub and plate-portions of my said improved car-wheel;

The said improved car-wheel has been subjected to every variety of test, and has proved itself to be the strongest, safest, and most durable car-wheel that has ever been ofi'ered'to the public.

\Vhat I claim as my invention, anddesire to secure by Letters Patent, isx The within-described method of casting car-wheels of two qualities of iron, thatis to say, one of said qualities of iron being poured into the portion of the mould designed to form the hub of the wheel, and the other 7 being poured into that portion of the mould designed toform the rimof the wheel, the two currents of iron meeting within the mould, and there acting upon and mingling with each other, substantially as set forth.

I also claim, as an improved manufacture,,a car-wheel produced of-two qualities of molten iron, by the method heroin set forth.

WILLIAM WILMINGTON,

Witnesses:

D. V. l -I. SIMPANY, DAVID GAnRUTnan's. 

